Rebuilt 5.7 Penta

[damian14]

I have a recently rebuilt 5.7 gxi Penta and replaced the distributor and coil with new MSD upgrades but now it feels like it has a restrictor plate at 3300 rpms and the take off is weak. Is there something else that needed to be changed or adjusted to take this upgrade?

 

[stresspoint]

I have a recently rebuilt 5.7 gxi Penta and replaced the distributor and coil with new MSD upgrades but now it feels like it has a restrictor plate at 3300 rpms and the take off is weak. Is there something else that needed to be changed or adjusted to take this upgrade?

first off ,explain how you set the timing , bad timing will do as you have described.

 

[Scott Danforth]

Being a GXi means it's injected.

Did you clean the injectors?

How did you set timing?

What MSD "upgrades"?

 

[damian14]

Being a GXi means it's injected.

Did you clean the injectors?

How did you set timing?

What MSD "upgrades"?

Injectors are new.
It was a seasoned, volvo penta mechanic who did the work for the whole motor.
Not sure how he set the timing.
In neutral I get all the RPM's I want but in drive is when it limits to 3300 rpm.

 

[damian14]

first off ,explain how you set the timing , bad timing will do as you have described.

Injectors are new.
It was a seasoned, volvo penta mechanic who did the work for the whole motor.
Not sure how he set the timing.
In neutral I rev all the RPM's I want, but in drive, it limits to 3300 rpm.

 

[Fun Times]

What MSD distributor part model/kit number did you install?
Hopefully a marine version compatible with your complex fuel injection connections.
Some have limiters that are added and some need adjustments.

• The Marine Pro-Billet distributors have been tested by Underwriter’s Laboratory and are certified to meet or exceed safety standards for marine ignition systems as set by the U.S. Coast Guard.
• Only three wires to connect for a simple installation (Ready to Run Versions)
• High output ignition module produces quick starts, smooth idle and improved mid range performance (Ready to Run Versions)
• Accurate and maintenance-free magnetic pickup never needs adjustment
• Easily adjust the mechanical advance with the supplied springs and stop bushings to fit your boat’s needs
• All of our marine distributors are equipped with flame arrestor holes machined into their billet aluminum housings.

Marine Ignition

Marine environments place rigorous demands on every component of the ignition system, especially the distributor. The combination of water spray, salt exposure, full throttle acceleration and harsh vibrations all take their toll. Marine distributors are UL tested and designed to meet the...

www.holley.com

Marine Distributors

Marine environments place rigorous demands on every component of the ignition system, especially the distributor. The combination of water spray, salt exposure, full throttle acceleration and harsh vibrations all take their toll. Marine distributors are UL tested and designed to meet the...

www.holley.com

 

[Scott Danforth]

Injectors are new.
It was a seasoned, volvo penta mechanic who did the work for the whole motor.
Not sure how he set the timing.
In neutral I get all the RPM's I want but in drive is when it limits to 3300 rpm.

what MSD "upgrades"

also, in neutral, your motor only needs to run on 3 cylinders to get to redline. and it will do it without more than a drop of fuel.

under load in gear, you need all 8 cylinders and you need a lot of fuel.

What is the fuel pressure?

 

[Scott06]

what MSD "upgrades"

also, in neutral, your motor only needs to run on 3 cylinders to get to redline. and it will do it without more than a drop of fuel.

under load in gear, you need all 8 cylinders and you need a lot of fuel.

What is the fuel pressure?

Wonder if it is this one that looks like a Delco EST marine rated plug and play knock off?

MSD 83663 GM Late Model HEI V8 Ext Coil Distributor- Black

GM late-model performance enthusiasts will be happy to see this Pro-Billet Distributor. The distributor, PN 83663, is a drop-in replacement for GM V8s using the small cap distributor with a dual connector coil found in cars from 1987-1993 and trucks from 1987-1995. The entire housing is...

www.holley.com

or this one not sure the difference

MSD 8366 GM Late Model HEI V8 Ext Coil Distributor

GM late-model performance enthusiasts will be happy to see this Pro-Billet Distributor. The distributor, PN 8366, is a drop-in replacement for GM V8s using the small cap distributor with a dual connector coil found in cars from 1987-1993 and trucks from 1987-1995. The entire housing is...

www.holley.com

 

[Scott Danforth]

If they are, its a lot of money to spend vs simply using the Delco Voyager.